Hello Pauline,
I had a look at this last evening but had nothing more to offer at the time- couldn't find the family in later censuses.
However, there are a couple of things arising from your post.
I think (and thought it last night) that Lopana is a mistranscription of Johanna. I just checked and still think that.
Also, I think she was a boot binder in 1871, which would fit with her husband's occupation of shoemaker.
On the other hand, the Grogan connection sounds good.

May I ask, are these people definitely your ancestors?
thanks
Heywood